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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3961b7e0493b0ddde91c6cd7673cb5f64248dfcd25decc432c5c8faf4611af8e' 
  AND token = 'JEHHve20jRTpV/3MfkN70uC1W3z9SPG/a1cCQosUwd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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