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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77f8bed722280dc26d854d7d454cabe5c503de51c23227bdeac2282e91f16786' 
  AND token = '7b4/Zp8bgylaUtulqYaY/0F3C8UalkHU96ONNYmIwvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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