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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d2625f057ffc50190908b663e49627414fd60bbd3f32e93cf2df599203869ca' 
  AND token = 'fpmZ7Z7lj5wZReK5fb6Os7BfNuqr3NfMk6E+8RP9QTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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