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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d9014e9e2b93e42d124901af49bc4960caae0eb6a3444f0675c8a5c5c2b95c9' 
  AND token = '5Unhx1aG9mlUC14cvTh59q4MfQGOJ8tGdLPP1gjRpAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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