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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b243ffff1e7cb502bdf90dac7ece096803d93bc0d0406f10c8002c7f1ba9a5f9' 
  AND token = 'h/lbv8sMFG/+VE8rMHPvP3r3N212bQOmMBSj+yXq/Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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