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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1c7893122586e0f4a182e0e91ae6ac83a2b634a6e7030e61ab3323bf75c9131' 
  AND token = 'leHrPOjK2tzy1DRP5Qp1/GPgAyG0MjyRytpXh6yx0Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}