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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dfba56d7a84816d89d0377e74a75e9f5237561d66097096b16f3737a936fdd6' 
  AND token = '2poKiisrto9ZpvBo3zjmrqMu+bWU8mNFtLnfyC332AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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