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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ca84825891935c9580cf271675ed24a9fbe6b1c945392e848c3f930aa42ffdc' 
  AND token = 'VwfbfMuGkMwksyOEHKIpoi1rhI423aqF2CFPXl3Spb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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