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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6e0cc7869ae6bfca75090ca82b543265ca4dc9c6780736e36558a64a3e44c2b' 
  AND token = 'krnugr5tPC1Byzvy5H6kcxdtedEU5oB3jMjhVQoV6G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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