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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ee46ccee64a37e0aef982ec46a7c5d853df92a0ea8be6da94036858f54ce3d4' 
  AND token = 'zkfZb1MfWw5Geuc3goETvUyuqT4V/MkEHV8OXqlyArc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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