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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76d188045aee3c754c1a2710307c25fe28bf5055412ae64b9638f2a5a27ee236' 
  AND token = 'RdPAoG1yYiVUGnlNmcX/RVG+lfMM2i+2jwHwb3B59Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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