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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32c21233755bdea4e3ede2ebde1094315c8c0d0cd40e84c7b77dcbf3893e7419' 
  AND token = 'i6JLz2EfqdiVoAxn2f+/2cls7dSuDnES95OXm2W3NIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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