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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a5d825190d20a1ff2fa0763ea33a295e92d930a6e7b5e4aa5ab011e0f48e892' 
  AND token = 'k7TmsyzWXo81eIyAXJ45xBLRlRRyY+Ga9j/SogRpV0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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