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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30ba38210fcee5a351c071b6ee870055dcfcc9afeaf3b54c726e15e79c2ff80d' 
  AND token = '8vd7Pp2mU8D6+KmOpfVfeRqDL2cegutpRF8S6b0+6N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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