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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e970f2242f02a6a401b3a7aad23afd6d33f076c8c1cbdf270d43dcee37184dd1' 
  AND token = 'VlJNtHeB/xvahkO+JXBoKVhAU7/hzsnM1FR2gO2BhJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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