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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b0a4fce95f6b75e34ecd38508401b0550c74fedf43887063f9e12e0203a521e' 
  AND token = 'ZglpWZ3Jyzu4JB5RecDgT6f5z8DW4jm88PrJU7h6src=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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