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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6714ef39eae6e3c300859a688935bda65b799f3b59344b067de5676bb1ef0d65' 
  AND token = 'vuXNiG+Nd0f8i2bHGoVPfsblHAwT2ZuLK2ivnmlU34I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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