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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecf8d9f0500d9a8cda8ce622f5ca5e5d21cfa2b051dd0513d25abff63b76d663' 
  AND token = '3hfzrY7khnd5ooRbzEe5LCDxkumfGAQFeFu72Ry1KJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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