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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7efc8df4b22531ccc796647a27c8d2edf6b20b0e14d8436044b512f24933fc59' 
  AND token = 'R31N0wboKFyxraw7LbKUfpt0Jy4FPY5AYRJ9UrQvS4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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