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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6367754f040367b05e474ca139aac6dba92b2eb2345096a8b992d163a12a75e2' 
  AND token = '/kP61MUjJgFRJRTDX0ROm5Bw2mfvFuEuX8SrWi8LetI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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