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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aab915f93744c05086423d4ce12407239d724d7a10997cbcb9184401f2f9b27a' 
  AND token = 'lbmdwgMJrAo7IC3/LWsy7TS8hXTEVo8/Ont7I/nF4jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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