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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c04eab27dacb5c086d8b66485346aafaf377c5b87ffa38eafaca3caa17e46523' 
  AND token = 'mbEqoUo8k7ba0dWjrXXaryPozgx3qKM3aumknb9+0Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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