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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbf3c20987427be598472a0c0fe6bb2b6eebc8db7d735b3a41e862f46e91793f' 
  AND token = '95gTEDG7sDk6BhrdAR6zR2Yq7U8yGDW7ykzWI73AR88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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