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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c62297d212313fe8ab27b8ad629b2ea51e6a00d235ee06f6302ff7a0a77d9646' 
  AND token = 'G51Ghs/KvdnU6HjtxZ5M1o629BuMiLDsItOghCIRdxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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