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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71894e9152deb056b604c1bf21f54d68a1d8d3b11e934148d9e5c225c3320050' 
  AND token = 'GlOd8MeyQim1N4reQMeCCt7Luk0v+wBBhH8RhP/o8gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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