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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56f9cccbc06713d69c5f6e9211e4e5e319ba79c3af312d4c6c21cfee95cd6cfa' 
  AND token = 'uOMLOJ2cnFKpNtkuMYYxsPXxPmY/+0DT6/CxSfmaQ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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