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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cbabff582a0dc5d3b647958908b8e2a35e2650432209f8c68f6b2a23b6b69b4' 
  AND token = 'wo0qDsf+Ir5U+gygJJ+9qzdE6HgtxQQUOonNMsi7ENQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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