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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a663be94f01abcb1ff5a40101664a2d35a7ac3fd2bdadc5c32abcb7d0cd4942' 
  AND token = 'uuRXHTzRCX4fVpMJ/oQ0z4pgks/RhGZBcMOoEh+N3hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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