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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '440c6903d261901f2991a39c81dc573e52ab5e50f319d4f628cec4aa723f01fa' 
  AND token = 'RI2W90CYzQ/j7P76fzduh5ADenv5pdbI6GtyRyEvjqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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