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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3f7e0cd38a1a19d8f4d23ec43093bc30696aef19f03190ed2f973088a17562a' 
  AND token = '09+4JMFfVtPkTPFdAKqjExNxR1xfJfD0FIxBFDCyhhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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