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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0b60ab5e6c6fc5dface154a5e5f6531b1dd72e4429500eef0a6808c7342fad2' 
  AND token = '6x1EksEoKNSKA5Ri4Yw95JV7m5pUDXc/PAg88kxCTjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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